August 1998
54AC139 • 54ACT139
Dual 1-of-4 Decoder/Demultiplexer
n Multifunction capability
n Two completely independent 1-of-4 decoders
General Description
The ’AC/’ACT139 is a high-speed, dual 1-of-4 decoder/
demultiplexer. The device has two independent decoders,
each accepting two inputs and providing four
mutually-exclusive active-LOW outputs. Each decoder has
an active-LOW Enable input which can be used as a data in-
n Active LOW mutually exclusive outputs
n Outputs source/sink 24 mA
n ’ACT139 has TTL-compatible inputs
n Standard Military Drawing (SMD)
— ’AC139: 5962-87623
put for
a 4-output demultiplexer. Each half of the ’AC/
— ’ACT139: 5962-87553
’ACT139 can be used as a function generator providing all
four minterms of two variables.
Features
n ICC reduced by 50%
Logic Symbols
IEEE/IEC
DS100269-8
DS100269-2
Pin Names
A0, A1
Description
Address Inputs
Enable Inputs
Outputs
E
O0–O3
DS100269-1
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© 1998 National Semiconductor Corporation
DS100269
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